haem Flashcards
henoch - purpura?
Henoch-Schonlein Purpura (HSP )= small vessel vasculitis caused by immune complex composite from infection triggers
triggers/ etiology for HP?
genetic predosipition, preceding infection (group A strep 1-3 wks before) & genetic pre-disposition, drugs, vaccines ,GI infection some antibodies (
pathophysiology of HP?
igA complex -> aggregate and deposit in target organs post URT infection.
CF of HSP?
palpable purpura, arthritis/arthralgia/ GI or renal sx.
-hematuria/ proteinuria. ARF/CRF
-rash over buttocks & extensor surface.
abdominal pain due to mesenteric vasculitis.
dx ? dd
autoimmune markers, fbc, high esr, cbc , platelet counts.
ddx: acute abdomen, renal syndromes, SLE, IBD, RA
treatment of hsp
immunosuppressive agent or self limited.
- iv fluids
iv prednisolone if severe esp if renal function compromised.
NSAId 1st line
DIC:
activation of coagulation syst6em caused via marked activation of fibrinolytic cascade.
acute and chronic cause?
acute: sepsis, obstetric shock, burns, hemorrhages, infections, acute leukemias., acute hemolytic transfusion reaction.
chronic: gastric/pancreatic Ca.
stages/ phases of DIC?
hypercoagulation: activation and overuse of the coagulation system.
-exhaustion due to formation of thrombi.
decrease in serum platelets. thrombocytopenia.
final: resolve, complication or death.
hyper vs hypocoagulation in thrombi formation in capillaries.
pathophysiology of DIC?
- damaged tissue release tissue factor.
- activate fibrinogen cascade and formation of micro-vessel thrombi.
3.reduction in conc of fibrin factors. impaired hemostatic status. - fibrinolytic activity: increase d-dimer activity.
5.FDP’s inhibit coagulatin factors and increase exporesison of thrombomodulin-thrombi complex in blood (diagnostic) activate protein c. inactivates factor 5a & 8a
acute vs chronic DIC?
acute: purpura, ecchymosis, bleeds in body orifices. digital gangrene and adult ARDS.
chronic: hemorrhagic crisis or asymtpomatic
DIAGNOSITC OF dic?
decrease fibrinogern activity, prolonged PT, APTT.
increase d-dimer,
generalised thrombocytopenia.
treatment:
heparin for acute: decrease fibrinogen-fibrin conversion. shuts off formation of thrombi.
fresh platelet plasma infusion
-LMW herparin for chronic: chronic embolism formation in metastasis.
warfarin: unsuccessful.
trx underlying cause and resect any tumors, radio/ chemo and immunosuppression.
MM
+ triad of abnormality
malignant proliferation of plasma cell’s in BM. triad of abnormalities:
1. accumulation of b-cells
2.punmched out lesions in Bone.
3. monoclonal aggregation of igG (secreted by plasma cells)
etiology & pathophysiology
no known genetic component or environmental factors (idiopathic) affects >60. BM cells stromal interact with cancerous cells and adhesive. CK , drug resisANCE AND GROWTH.
ck released and harms body. iL-3 inhibit osteoblast progenitor. OPG inhibited via DKK1 and inhibits osteoclast. osteoclast can stimulate via IL-6 amplification of MM. hypercalcemia-> nerve issues & dheydration.
clinical features
backpain, fractures, URTI, anaemia, RF, proteinuria, dehydration. scans show lytic bone lesions.
bone marrow< 15 % normally. MM shifts hemopoietic stem cell-> abnormal Ab (just light chain-paraportein; igG and igA).
diagnostic
light chain -bens johns proteins. shift of haemopoietin SC shift from myeloid to lymphoid proliferation. increase n paraprotein, decrease in normal AB, urea/nitrogen, hypercalcemia, anaemia, increase in creatinine. CT/X ray shows bone changes. bone profile test. bone aspiration and bone marrow biopsy. >10% monoclonal plasma cell in BM, Ab urine/ serum.
mneomic (CRAB)+ extra details:
Calcaemic Renal failure Anaemia Bone lesions.
Bone pain with hypercalcemia 🡪 neoplastic pl cells activate RANK receptor
on osteoclasts = bone destruction. “punched out” lesions seen on x-ray - ↑ risk of fracture
↑ risk of infx 🡪 monoclonal ab lacks Ag diversity; infx most common cause of death
10 AL amyloidosis = free light chains circulate in serum + deposit in tissues
Proteinuria = free light chain excreted in urine as Bence Jones proteins 🡪 ↑ risk of renal failure